Variable condenser



April 13, 1926.'

Y filed June, 5"; 1922 2 sheets-sneu 1 m w m FISE,

FJQi

' INVENTOR April 13 1926.

' P. E, EDELMAN VARIABLE CONDENSER Filed. Jun 5, 1922 2 Sheetsv-Sh-eet FISE@ F169 /7 Flew INVENTOR fr Cs@ FIG. l5

Paiement Api. '13.- 192e.

BATIEM orsi v 2311.123.. Ensim, or 'NEW Yoan, N. Y.

l. yanmnnn coNnnNs-nn.

Y nppucatioaaiea 'Jane 5,

Be it known that I2 pmu, ,l .1g-citizen of the' United States, ofNoI 9 Church Street, city of' New York, countyor" New, York, and State 'of New York, have invented certain new and useful improvements in variable condensers, and more particularly. variable air oondensers' of the Korda pe,"`s'ucli-;as arefusedjn radio apparatus, of 'which the f ollOWing-is a specicati'on.

' My present invention relates to theyimprovenients inthe construction land assemby i Vof variable-condensers of the class describe and the objects of my improvements are,

first, to provide. an inexpensive: ri idassembly; second, to provide a counter alanoe i '5 which may be assembled with the movable vjIiand-fittingg fifth, to provide means where-` to change the capacity of the device..

Fig. v1 iS-ja front elevation plates of saidcondenser; third, to .provide` an accurate' lock 'for ;the' 'movable lates without-the use of cast-in-or--soldei l construction; .fo'urth, to provide means to lock the lplates in true parallel position withdrespect to each other without the necessityv of by one or more plates may be easily removed I attain .these objects by themechanism illustrated in theaccompanying drawings, in'whichl showing the assembled condenser.; Fig. 2 Vis agfront sectionalized view showin the metal inserts and construction used. ig.- 3 is a plan view projected from the view in Fig. 1. Fig.` 4 is a partial section taken along the line AA of Fig. 2; Fig. 5. is a fra is a plan and front elevation illustration showing the construction` of the movable plates used. Fig. 7 is an illustration showing plan view and front elevation of the blank stam ing used for the fixed plates..`

Fig. ,8 is, a. ont elevation and bottom view illustration showing the support lates. Fig. 10 is a sidefview projected from ig. 9; Fig. 11.is abottom view proJected from Fig. 9 ;..Fig. 12 is lan illustration showing in front elevation and -bottom view the A entary' view taken along the line BB of ig. 2.. 'Fig. 6

post. used;v inFig. 1. Fig. 9 is a front elevation showing the' shaft used for, carrying the movable f the 1922. Serial No. 566,130.

ber in Fig. land Fig. 2. Fig. llffisan illustration in plan View and side elevation showing the lock-ring member used on the' r shaft 17 ofr'Figs'L`9 and 2. Figpl is an @"1 illustration in plan View and in side elevation sectioned showing they top insulating support'member :of Fig. 2. Fig. V17 is an illustration and plan view and' sidefelevation sectioned showin the bottom insulating 65 ring used inV Fig. 2.- gFig. 18 is an isometric view 'of -the loclrfbar u'sed in .co-operation with the lock-ring of`` Fig.. "15. f -The lock Aholds` hole 6 of plate l shown' in Fig, and v4the slot'2'6 offmember 17 shownin Fig. 18, 70

'when assembled' as shown iii Fig. 1

iinilar numerals' refer tosimilar parts I through the several views.- 1 f f -f Heretoforein'eo-n'structionof variable air 75 condensers of the-Korda type which have been known in theart for about 20years, it. has been .diflicult to obtainan accurate-con denser o f inexpensiveI construction, and to l maintainv the movable .plates in accurate 30 alignment with res'pectto the fixed plates so z v that'a condenser of thistype may be shipped through the iii'ails without damage. One of the objects of this inventioi'i.V has -in views.' simplified newcoiistructionjwhich -a'lords a 95 very durable-and simple device. Referring u nowto the individualpai'ts used in the conl struction, i. e., tosay Figs. 6 to 18 inclllsive, I will first describe and-fp'oin't out cerf t'a1n 'features therein, aftervvhicliv I will.90 specify and describe the manner ofassei'nbl'y f asA shown in Figs. 1Vto 5' inclusive.

In Fig. 6, plate 1 -is :constructed '.titoiii'No.4 22, 24 0.1226. gauge, and metal such as. `aluinif $1111.11, zinc or brass,-.and may be stamped in the form shown with a smooth edge 2, a'i. substantially square slot 13, 'projecting Supi port members 4 and 5 respectively, andr alock:

ole 6, vthe urpose-'oi which Iwill presently appear. e fixed plate 7 is 'similar-l 100 stamped outwtha smooth yedge' 8, a'. round)I ed portion 14-,atted ortins 9 and'l() i'ovided respectively wit 'abutments 12 an 11 andla 'atted portion' 13,' thel purpose of which will presently appear.- 105 In Fig. 8., the'supiort'postl, preferably of brass, itsuprovid with interior threaded' l ends 17 a 18 respectively, and carries a of slots 16. moulded into its side.

These slots -are Aproperly pro o rtioned 'sothat 110 plate 7 when force-{itt'e into one-'of the l slots .16, is securely held thereby. In Fig.9,V

i shaft 17, preferably made from brass in an automatic screw machine, is provided with a ,threaded portion'18 at the top and a thread 20 at the bottom portion., The portion 25 of this shaft 17 contains fa series. et slots 24;

of proper size such that theplate 1 or Fig.

` 29at the other, and is used as shown in Fig."

2 as a support member between the top and' l vbottom insulating disk members shown rel 25, speotively in 'Figs 16 fand 17.

6 may be inserted into one'ot said slots 2d snugly. .d slot 26 is also moulded' into lpor-.- tion or" member 17 whereby the loch bar shown in Fig. 19 may beslid into said slot 26 and through said lo'clrhole 6 ot member 1 shown in Fig. 6 for the purpose which will be presently described. By retrsrring now to the bottom'view projected trom hhg. 9,

that is to say Fig. 11, it will be seen that the portion 26 is Hatted Aon three sides; that is to say, 25, 21 and 23,jt o tit the slot .3 o fmember 1 shown in Figure 6 so that member 1 will not be rotatable about shaft member 17. vIn Fig. 12, .the auxiliary brass--post27,

carries internal'threadsZS at one end -and In Fig. 13V a brass or phosphor bronze l spring is shown.- This spring made substantially in the shape. illustrated wlth a hole 33 in one lend anda rounded-portion 35 containing a slot 34C, the purpose or' which will presently appear. In lFig.. 14 a stand-v ard'type bindingv post member '36 1s" shown with a projectnfr' portion 39 formed therein. In Fig. 15 t 'e brass look-ring` 40 has a hole 41 formed ltherein to t the upper portion of the shaft 17 or the lower shaft por tionl of member y17, and also contains another hole 42 of the same size as the hole .6 of memv berl .which is shown in. Fig. 6. The-purpose of ythisring4 will be .presently described. In Fig; 16,-`an`insulat1ng-disk 43,y prefer--` lably,made from phenol condensation product, hardmubbenor other moulded insulatl lin material oontainsthe'metal inserts 46, 50 an v`51. These metal inserts are either cast l The member 43 also has imbedded or forcee.

fitted into it a metal inserted which comprises a bearing l5 to' lit the top pmrtionforp shaft 17 showrr in lFig- 9... ln iEig. 17'thfe lower insulatingy disk member "57 contains a similar inserted bearing 58v with hole 59 'of sizei to fit the lower v'portion 17 of shaft 17. Fig. 18 shows the brass lock bar which is used to hold the member 1 to the shaft member 17 Referring now to Fig. 1 and Fig. 2,.'the

ymovable plates 1 are all of identical? construction., and are assembled o'nthe shaft member 17 as follows z-The member 1 is inserted into its co-operating slot 2t of meme ber .17, then lock bar 66 is slid through slot 26 of member 17 and through hole @of member l as shown. rings .40 are placed at each end portionjof the co-operating Next the two. lock" member 17 as shown in such a manner that the hole 42 ot lock ring l0 tightly holds look bar 66. 'lhis securely locks each plate member 1 to shaft member 17. Also the counterweightmember 67 is similarly mounted on and locked to shaft member 17 as shown; The purpose of the v'counter weight member 67 is to odset the weight. or" the movable plates 1, so that shaft 17 when set in a particular positionwill stay there. tration clearly shows it assembled so that anyone skilled v in the art may make and use same. The stationary plates areassembled A by merely inserting 'the plate member 7 into I v(slots 16 provided under support member 15'. v l

Now when the top insulating disl;"4:3'and' Ythe-bottom insulating-disk 57Qare joined as, .y

shown' by vsupport members- 15 and-support'.

ly rotated. The shaft 17 may t ereby be rotated the full 360 degrees, and inno case will therotatabile'plate's 1,. etes ever touch the lixedplate'sf'f', etc., owing to this new construction. The' spring member 32 is mounted as shown to l-keep the-shaft portio'lrg u. 18 ofv member 1 7 abutt'ed aga-inst the top lock washerpflO vwhich 'bear'son metal insertv 4:4:- carried in 'insulating disk 43:2 -A screw- 74e permits the.=i"riction of the bearing of said springmember 32 against llower lock washer 40'to be adjusted. 1 Spring member 32 also serves as la connection between binding post 36'and`the' movable plates shaic'tv 17. The other connectionto the 'fixed plates 'is madeby screw mmbe 69.- y The"counterin higsf?, and so .that .its centerof gravity is'ot equal 'value'to".theeenter of gravity .of all of' the mounted movable plate-memvbers 1, etc... lnrase a-condenser or' smaller y capacity"v isde'sired, it is merelynecessary to= remove a portion ora certain number of the plate'A members 1, etc. from the i117," and to replacethe remaining'plate mem-y bers 1 to' affordy a condenser of smaller (zapacity.' ln Fig. i the manner in which the-f plates are held-isshown in detail.v In Fig.-

5 a further-fragmentary view is shown in.'

order to still more clearly show this asf i f sembly. .It'willibe observed` that-inf. course of construction no solder is necessary, in ac# 125 Acordance with this invention.

'My condenser may beused for a varietywy of purposes 4such 4as' laboratory vmeas'ure-v ments,'radioapparatus transmitting andreceiving setsand other e ectrical circuits; lnserti-members 46, 51 and 50 carry'tbreaded weones portions 4'( 'so that the entire condenser 'may trated my invention, I will more' particularly point out what is new and` .useful in the appended claims. lVarious changes may be made within the-.spirit 'of'.this invention I claim and these Letters Patentfare to be'understood as set forth 1.v A variable' condenser comprising in combination, a rotatable shaft havinga series of slots,lrotor plates constructed to v fit into said slots, a counter weight for said hold Asaid rotor plates, a locking pin to fasten'said vplates and-counterweigbt to said shaft, a

pair of insulated bearing supports Jfor said shaft, aseries of stator plates cooperativev relation to said shaft bearing supports, anadjustable friction member to said stator plates, andmeans to hold the rotor and stator plates in parallel alignment,

including cooperating supports for said statorplates,comprising slotted holders 'therefor. l A

-' 2, In an air condenser for radio and other electrical circuits, a shaft, a series of plates Vmountedon said shaft, a lock-bar extending along one surface of said shaft and throughsaid plates, a lock-ring cooperatand within the scope of vsaid appended 'claims carried in shaft and rotor plates spaced fromv ing with said shaft and said lock-bal', ,mp/3ans v tomount and support said shaft anda seriesy of stationary plates supported by 1 said last named support means. 'f

3. In a rad1o-condenser, 1n combination, Y

a Series ofstatwnaryplates, -vsupportingri means for said plates comprising three met al `posts containing a series of slots of! size such that said stationary plates may be force-fitted intosaid slots, top and bottom members for said supporting mountings, a metal bearing comprised ineach of said top and bottom mounting support members respectively, l p bearings, a series of l slots'. carried and formed into said shaft, a series ofplates 'car-i ried by said shaft, and of such thickness as to fit snugly into said slots formed. `into said shaft, a locking memberto secure each 55 of said movable plates to said shaft, and a co-operating slot longitudinally out into said shaft to hold said lock bar. f

J4. In a radi'o condenser having a se'ries f rotor plates, the su'pportin sur- 'face between said shaft and plates eing non-circular in contour, and a metallic ele-r ment longitudinally. disposed to bind' said 65 rotor plates as a unlt with said rotor mem# ber. v i v e In witness whereof, I have'hereunto subscribed my name and legal seal this 27thF day of May, 1922, at NewYork city, county 7 9 and State of New York.v PHILIP E. EDELMAN. [14. s.]4 p

a shaft journalledin said rotor I stator `plates the improvement which com 60 prises a rotor member includingashaft and t 

